Khoua made his international debut at the 2014 African Youth Games, where he won a bronze medal in the long jump with a mark of 7.23 metres, losing to Yasser Triki.

[3] The following year, he won his first international gold medal at the 2015 African Junior Athletics Championships, defeating Triki in the process.

The mark earned him a silver medal behind Lamont Marcel Jacobs, the eventual Olympic 100 metres champion.

That would be one of three international medals Khoua would win that year, also placing third at the African U20 Championships and second at the Jeux de la Francophonie.

[1] At the 2021 Arab Athletics Championships, Khoua returned to medal-winning form with a 7.60 m jump for silver, losing only to Triki again.